Search found 2399 matches

by Prime
Sun Feb 18, 2018 3:39 pm
Forum: development tools
Topic: Couple of BeebASM usage questions.
Replies: 10
Views: 244

Re: Couple of BeebASM usage questions.

Just a small update, not got to solving the disk writing yet..... But for the format/verify code I have done the following : Since BeebASM will let you assemble multiple things in the same block of 64K I simply included the rom code when assembling format, so that it is also assembled and it's symbo...
by Prime
Fri Feb 16, 2018 11:31 am
Forum: archive requests
Topic: "Home computing weekly" magazine issue 1
Replies: 1
Views: 114

Re: "Home computing weekly" magazine issue 1

Bloody hell that's gotta be the wort scan I've seen of a magazine, looks like it was scanned on a ZX81!

Cheers.

Phill.
by Prime
Thu Feb 15, 2018 1:25 pm
Forum: hardware
Topic: Memory for 80286 second processor
Replies: 15
Views: 300

Re: Memory for 80286 second processor

I thought of overclocking, but the processor itself is stamped as a 4 MHz part. Whilst I’m quite happy overclocking my modern intel procs, a 25-50% overclock of a 30+ year-old cpu is possibly unwise, particularly when I have to find a replacement when I fry it! What sort of socket is your 80286 in?...
by Prime
Thu Feb 15, 2018 11:05 am
Forum: hardware
Topic: Memory for 80286 second processor
Replies: 15
Views: 300

Re: Memory for 80286 second processor

I'm going to take a punt at HM50256-15 ( datasheet ). They're 256k x 1-bit chips, which makes for a total of 1024k RAM. They also look to be pin-compatible with the 4164. They are with one exception, Pin 1 on the 4164 is either not connected or is internally connected to +5V. On the 41256 it's the ...
by Prime
Thu Feb 15, 2018 9:37 am
Forum: development tools
Topic: Couple of BeebASM usage questions.
Replies: 10
Views: 244

Couple of BeebASM usage questions.

Hi all, Some background on what I want to achieve...... I've been working on converting the disassembled Acorn System ROM to work with a 177x disk controller rather than the 8271. That bit is mostly done and I can now load programs from disk and run them correctly. However as the System dos rom is o...
by Prime
Thu Feb 15, 2018 9:22 am
Forum: hardware
Topic: Memory for 80286 second processor
Replies: 15
Views: 300

Re: Memory for 80286 second processor

Edit: The specs for the ABC300 state 1024K, so they’re 32K chips. Or possibly 64K chips with only one bank populated? I'm asssuming that they are 16pin devices? If you know the orientation of the chips you may be able to work out what they should be by tracing the power pins. Chances are they will ...
by Prime
Thu Feb 15, 2018 9:20 am
Forum: acorn atom
Topic: ICET and XC6SLX9 Mini setup.
Replies: 3
Views: 172

Re: ICET and XC6SLX9 Mini setup.

Next question, is my board a Jason board or a Jason flipped? (I'll include pictures). It's currently jumpered as a "non flipped", so when plugged in the USB port should point towards the keyboard. I assume you mean on a beeb, currently I'm (wanting to) use it on my System clone board :) T...
by Prime
Wed Feb 14, 2018 11:30 pm
Forum: acorn atom
Topic: ICET and XC6SLX9 Mini setup.
Replies: 3
Views: 172

ICET and XC6SLX9 Mini setup.

Hi All, I'm trying to setup the XC6SLX9 Mini board along with one of Jason's boards to do 6502 debug. Firstly I have modified my XC6SLX9 Mini board as it is one of the later ones that has the single row of pins for the JTAG at right angles to the board so I have removed and replaced with a right ang...
by Prime
Wed Feb 14, 2018 7:41 am
Forum: other vintage computer hardware, software and games
Topic: Apple II Super Serial Card Rebuild
Replies: 19
Views: 419

Re: Apple II Super Serial Card Rebuild

I might leave the FTDI out as it can easily be plugged in externally solving the issue immediately :) from a design point of view it makes more sense to have it in the cable. Except then you are converting 5v->+/-12V and then back again. Guess if you used a group of 7 jumpers (pin type), so disconn...
by Prime
Tue Feb 13, 2018 11:45 pm
Forum: other vintage computer hardware, software and games
Topic: Apple II Super Serial Card Rebuild
Replies: 19
Views: 419

Re: Apple II Super Serial Card Rebuild

Does anyone know if there'll be any issue with the 65C51 outputs/inputs fanning to both the MAX232s and FTDI? Fan out/in isn't mentioned in the 65C51 datasheet. Obviously you won't use USB/RS232 at the same time. I hope. Or does it need a more elaborate switching arrangement? For outputs from the 6...
by Prime
Tue Feb 13, 2018 2:41 pm
Forum: off-topic
Topic: Dodgy PSUs from China
Replies: 4
Views: 338

Re: Dodgy PSUs from China

After the thread on deathdapters and rumours of cheap PSUs from China catching fire you're brave. On the other hand I thoroughly approve of giving equipment a new lease of life rather than just scrapping it. Indeed, the one place I tell people never to cheap out on is power supplies. Always buy the...
by Prime
Fri Feb 09, 2018 7:42 am
Forum: other vintage computer hardware, software and games
Topic: Apple II Super Serial Card Rebuild
Replies: 19
Views: 419

Re: Schematic notation...

One of the things I thought of doing in a remake was a header for ttl serial, so you could plug in one of the ttl serial adapters that people use with microcontrollers. Also using one of the more modern rs232 level shifters like the max232 / max202 (or eqivilents) that just need a 5V supply. Cheers....
by Prime
Fri Feb 09, 2018 1:27 am
Forum: other vintage computer hardware, software and games
Topic: Apple II Super Serial Card Rebuild
Replies: 19
Views: 419

Re: Schematic notation...

danielj wrote:Yup, just found a picture of the board and that tallies. Thanks all :)

I have a super serial, lemme know if you want me to take some pics / make measurements etc. Wondered about doing a re-engineer of it.

Cheers.

Phill.
by Prime
Mon Feb 05, 2018 5:02 pm
Forum: general
Topic: Today I received.....
Replies: 4431
Views: 274935

Re: Today I received.....

My 6502 collection expands again... I think a couple of those keys need some keyswitch cleaner though. Haven't dared try turning it on yet for fear of the magic smoke! :D Hi, this one came with the last Haul pick-up... It's pretty dirty (cleanable) but it works... :D Kieran, Wim, would it be possib...
by Prime
Mon Feb 05, 2018 1:21 pm
Forum: development tools
Topic: BeebAsm
Replies: 30
Views: 1857

Re: BeebAsm

I do that by writing a file that defines them and then includes the real file (iirc). The problem is you need 2^n files where n is the number of options. That's only for binary options too, if you had a source file you wanted to build for several platforms, it would actually be worse. It's ok if yo...
by Prime
Mon Feb 05, 2018 9:18 am
Forum: development tools
Topic: BeebAsm
Replies: 30
Views: 1857

Re: BeebAsm

Is this still the place to get the latest version? As the last post is over a year old :)

I could really do with having some way of specifying symbols on the command line.

Cheers.

Phill.
by Prime
Sun Feb 04, 2018 5:38 pm
Forum: acorn atom
Topic: Abasic2/3 and SBasic2/3
Replies: 17
Views: 566

Re: Abasic2/3 and SBasic2/3

Right, I've been merging the changes into my BeebASM version of the source, with a view to combining the 1770 disk routines form my Atom interface, I may actually prototype with one of the Atom boards as they are essentially the same bus :) Noticed one thing, the jump to EXEC a boot file in the bloc...
by Prime
Fri Feb 02, 2018 9:25 am
Forum: acorn atom
Topic: Abasic2/3 and SBasic2/3
Replies: 17
Views: 566

Re: Abasic2/3 and SBasic2/3

Just a bit of fun, but I was looking at the 40-column (teletext) System Kernel code and was able to tweek it to do teletext character conversion so ASC"#", ASC"_", ASC"£" are displayed as # _ £ as on the Beeb: SYS5-40.zip Right I'll have a go at merging that into my so...
by Prime
Tue Jan 30, 2018 4:55 pm
Forum: other vintage computer hardware, software and games
Topic: Variable phi2 frequency.
Replies: 2
Views: 140

Variable phi2 frequency.

Hi all, Some of you will have no-doubt seen my System clone at the recent meetup, I'm now thinking about enhancements..... So I can get a WD65C02 CPU that is rated for 14MHz, whilst I don't think that it will be possible to run the whole system at that speed I would think 4-6MHz should be possible. ...
by Prime
Mon Jan 29, 2018 3:16 pm
Forum: software: other
Topic: Read Word Wise Plus files on PC
Replies: 15
Views: 461

Re: Read Word Wise Plus files on PC

What I'd have done in the first place is to make a disk image of the floppy first (onto the USB), then work with that. In fact, DON'T TOUCH THE DISK!!! Image it straight away , then you can access the imaged sectors to recover the file. When you delete a file on most filing systems, all you do is r...
by Prime
Fri Jan 26, 2018 9:00 pm
Forum: software: other
Topic: Read Word Wise Plus files on PC
Replies: 15
Views: 461

Re: Read Word Wise Plus files on PC

What I'd have done in the first place is to make a disk image of the floppy first (onto the USB), then work with that.

Cheers.

Phill.
by Prime
Fri Jan 26, 2018 9:11 am
Forum: software: classic games
Topic: Most disappointing conversions from other systems
Replies: 51
Views: 1895

Re: Most disappointing conversions from other systems

I think part of this depends on which version you played first, which Is why I prefer the Dragon version of Chuckie Egg to the beeb, I'm more 'used' to it. Though in this case the Beeb version is deffo a close second.

Cheers.

Phill.
by Prime
Fri Jan 26, 2018 9:06 am
Forum: other vintage computer hardware, software and games
Topic: Received a belated Christmas present...
Replies: 15
Views: 745

Re: Received a belated Christmas present...

Excellent haul there Wim, Is that a Spectravideo machine in there, I also see a Tandy portable, a BBC master, and Apple IIe, Toshiba MSX and I presume a C64 or Vic20 as there is a commie floppy drive..... I see you also got an Enterprise manual, did you get the computer with it as they are fairly un...
by Prime
Thu Jan 25, 2018 7:06 pm
Forum: acorn atom
Topic: Abasic2/3 and SBasic2/3
Replies: 17
Views: 566

Re: Abasic2/3 and SBasic2/3

I'm curious to find out how closely these versions of Acorn BASIC resemble BBC BASIC. I'm sure I've read recently (on *.) that BBC BASIC was likely developed on a System - which makes sense. Is SBASIC aka "Super BASIC" and does it have some BBC BASIC key words like PROC? Or is it closer i...
by Prime
Thu Jan 25, 2018 10:34 am
Forum: acorn atom
Topic: Abasic2/3 and SBasic2/3
Replies: 17
Views: 566

Re: Abasic2/3 and SBasic2/3

I've downloaded and checked the Atom versions in Atomulator and they now appear to be saving correctly thanks. This was once I figured out that Firefox was still giving me a cached copy from yesterday, and downloaded a new one with chrome! I'll check the system versions when I'm at home this evening...
by Prime
Wed Jan 24, 2018 6:58 pm
Forum: acorn atom
Topic: Abasic2/3 and SBasic2/3
Replies: 17
Views: 566

Re: Abasic2/3 and SBasic2/3

I was sure it worked when I created them some years ago. I'll boot up the A5000 and re-check the code. Cheers :) Looking at the code I wonder if the problem is in the .LBEDD routine : \ Set FILE.LOAD to MEMHI.PAGE \ --------------------------- .LBEDD JSR LBED2:DEY:STY F_LOAD+0 LDA &18:STA F_LOA...
by Prime
Wed Jan 24, 2018 10:27 am
Forum: acorn atom
Topic: Abasic2/3 and SBasic2/3
Replies: 17
Views: 566

Re: Abasic2/3 and SBasic2/3

A little bit more digging in Atomulator...... I trapped at OSSAVE : $FFDD : FFDD : JMP (020E) >r 6502 registers : A=28 X=37 Y=28 S=01FD PC=FFDD Status : C FFDD : JMP (020E) >m 37 0037 : 00 9E 00 28 1C 40 28 28 1D 28 00 00 00 00 00 00 .×.(.@((.(...... So this looks like : filename at $009E, load addr...
by Prime
Wed Jan 24, 2018 9:41 am
Forum: acorn atom
Topic: Abasic2/3 and SBasic2/3
Replies: 17
Views: 566

Abasic2/3 and SBasic2/3

Hi all, I've been playing with abasic2/abasic3 (and sbasic2 /3 on my system clone). And have noticed the following problem. If you try to save a program with save "filename", a file is created but the basic code is not saved into it. Doing a *info on the saved file : *INFO TEST TEST 2800 4...
by Prime
Mon Jan 22, 2018 11:53 pm
Forum: acorn atom
Topic: Thinking of building your own Acorn Atom ??
Replies: 6
Views: 364

Re: Thinking of building your own Acorn Atom ??

Wow, that's a fast Atom ....... :shock: Hopefully all other chips can deal with this speed. With modern RAM and the WDC65c02, you should be able to crank things up a bit. I seem to remember having my Atom clone running at at least 4MHz, I think I also pushed it further. Mind it does have Xilinx CPL...
by Prime
Mon Jan 22, 2018 2:41 pm
Forum: hardware
Topic: Files from modern PC to DFS disk....
Replies: 13
Views: 372

Re: Files from modern PC to DFS disk....

Since you have a data centre can you not just copy files to a usb stick then copy them to a floppy disk using the data centre? I might do that too, though doing it with beebem, means I can test them in an emulator first (as this is stuff for Atom / System which of course also uses DFS format disks)...